Table 3.

Different meta-analytical approaches to assess TCF4 rs9960767 genotype effects on mean percentage PPI across both investigated samples [healthy volunteers from London, UK (n = 96), and a schizophrenia spectrum sample from Bonn, Germany (n = 105)]

Effect sizeZp value
Fisher's trend0.0002
Stouffer's z trend method0.0001
Weighted integration methodad+ = 0.944.120.00002
Random-effects modelaDelta = 0.944.120.00002
  • aAccording to Hedges and Olkin (1985).